泵前管道波纹管对推力测量的影响分析

Analysis of effects of bellows in front of pump on thrust measurement

液体火箭发动机试验推力测量的准确性对评价发动机性能意义重大。为减小1 200 k N液氧/煤油发动机地面试验时由于试验系统的原因对发动机推力测量准确性带来的影响和提高推力测量精度,针对1 200 k N液氧/煤油发动机试验台的推力测量系统,通过理论分析和试验验证的方法分析了泵前管道推力分离面上的2台波纹管的受力状态及波纹管在低温状态和受压状态下对推力测量的影响,获得了波纹管的竖向推力损失、低温与常温推力原位校准斜率修正系数、负推力修正系数等重要数据,并提出了波纹管安装固定要求,为修正1 200 k N液氧/煤油发动机推力测量数据、提高发动机推力测量准确性提供依据。

Thrust measurement in LRE test process is significant to estimate the LRE performance. To decrease the influence of test system on thrust measurement accuracy and improve thrust measurement accuracy in ground test of 120 t LOX/Kerosene engine, the forced state of two bellows before pump and the influencing of the bellows in low temperature and pressure status on thrust measurement were analyzed with theoretical analysis and test verification method. The longitudinal thrust loss, thrust local calibration coefficient at low/normal temperature, and negative thrust correction coefficient were achieved. The fixing requirements of the bellows was proposed to ensure the accuracy of thrust measurement data in test process of 120 t LOX/kerosene rocket engine.